<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div id="app">
    <h1>{{message}}</h1>
    <h2>{{count}}</h2>
    <button @click="add">+++</button>
  </div>
  <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
  <script>
     const app = new Vue({
    el:'#app',
    data : {
      message:'zhiyin',
      count: 10
    },
    methods:{
      add(){
        this.count +=10
      }
    }
  })
  
  </script>
</body>
</html>